I bought a use Wii U from a pawn shop down the street from where I stay
and I got lucky when I was looking at the Firmware Versions coming a cross (Version 5.0.0 U)
and On top of that it was Under $100 bucks
But when I got home and Box back up My OG Wii and Unbox the Wii U and got everything ready
The damn Wii U Had parental lock on it

So I called up Nintendo and I told them I just pick up this Wii U from a pawn shop
And I'm lock out of doing anything with it,
So they ask for the Inquiry Number,
And they gave me the master key
And Now The Wii U is still on 5.0.0 U
With a Hack vWii with in it
So from there I Open up the The Master Key Logs
Link
Wii U - Master Key Logs
No't knowing if it can be any Help to anyone but Keeping a Log May Shed some light on it?